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4*x-((4*x)/3)-(3/5) = 21*x-(13/15) // - 21*x-(13/15)
4*x-((4*x)/3)-(21*x)-(3/5)+13/15 = 0
4*x+(-4/3)*x-21*x-3/5+13/15 = 0
4/15-55/3*x = 0 // - 4/15
-55/3*x = -4/15 // : -55/3
x = -4/15/(-55/3)
x = 4/275
x = 4/275
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